Refactor all of the unit conversion code

app/Interfaces/Model.php

@@ -5,9 +5,16 @@ namespace App\Interfaces;
 /**
  * Class Model
  * @property mixed $id
+ * @property bool  $skip_mutator
  * @package App\Interfaces
  */
 abstract class Model extends \Illuminate\Database\Eloquent\Model
 {
     public const ID_MAX_LENGTH = 12;
+
+    /**
+     * For the factories, skip the mutators. Only apply to one instance
+     * @var bool
+     */
+    public $skip_mutator = false;
 }